he same
individual animal._--In the eleventh chapter, many cases of reversion by
buds, independently of seminal generation, were given--as when a leaf-bud
on a variegated, curled, or laciniated variety suddenly reassumes its
proper character; or as when a Provence-rose appears on a moss-rose, or a
peach on a nectarine-tree. In some of these cases only half the flower or
fruit, or a smaller segment, or mere stripes, reassumed their former
character; and here we have with buds reversion by segments. Vilmorin[85]
has also recorded several cases with plants derived from seed, of flowers
reverting by stripes or blotches to their primitive colours: he states that
in all such cases a white or pale-coloured variety must first be formed,
and, when this is propagated for a length of time by seed, striped
seedlings occasionally make their appearance; and these can afterwards by
care be multiplied by seed.

The stripes and segments just referred to are not due, as far as is known,
to reversion to characters derived from a cross, but to characters lost by
variation. These cases, however, as Naudin[86] insists in his discussion on
disjunction of character, are closely analogous with those given in the
eleventh chapter, in which crossed plants are known to have produced
half-and-half or striped flowers and fruit, or distinct kinds of flowers on
the same root resembling the two parent-forms. Many piebald animals
probably come under this same head. Such cases, as we shall see in the
chapter on Crossing, apparently result from certain characters not readily
blending together, and, as a consequence of this incapacity for fusion, the
offspring either perfectly resemble one of their two parents, or resemble
one parent in one part and the other parent in another part; or whilst
young are intermediate in character, but with advancing age revert wholly
or by segments to either parent-form, or to both. Thus young trees of the
_Cytisus adami_ are intermediate in foliage and flowers between the two
parent-forms; but when older the buds continually revert either partially
or wholly to both forms. The cases given in the eleventh chapter on the
changes which occurred during growth {38} in crossed plants of Tropaeolum,
Cereus, Datura, and Lathyrus are all analogous. As however these plants are
hybrids of the first generation, and as their buds after a time come to
resemble their parents and not their grandparents, these cases do not at
first appear to